Bertsch, H., & Johnson, S. (1982). Comparative Opisthobranch (Mollusca: Gastropoda) Zoogeography, With Emphasis on the Pacific Basin (Hawaii and California): Faunal Composition, Provincial Affinities, and Subtidal Density. Iniversidad Autónoma de Baja California.

Bertsch, H., und S. Johnson. Comparative Opisthobranch (Mollusca: Gastropoda) Zoogeography, With Emphasis On the Pacific Basin (Hawaii and California): Faunal Composition, Provincial Affinities, and Subtidal Density. Iniversidad Autónoma de Baja California, 1982.

Bertsch, H., und S. Johnson. Comparative Opisthobranch (Mollusca: Gastropoda) Zoogeography, With Emphasis On the Pacific Basin (Hawaii and California): Faunal Composition, Provincial Affinities, and Subtidal Density. Iniversidad Autónoma de Baja California, 1982.